I found out it is possible to walk 4x faster, like in Yume Nikki. I don't know if this is already known, but nevermind.
When in .Flow, go to your room and walk into the chair pressing shift key right after you hit action button, this makes Sabitsuki to sit on the floor, on the chair, and when you stand up again you will be able to open the menu, I don't know why. Then choose the Broom effect and walk off the chair. You should be walking 4x faster now.
Activating another effect will cancel this trick as you're actually using Broom effect, and you have to return to your room to activate it again.